Gas-mixer



INVENTOR ATTORNEY Patented Nov. 2, 1920.

JOHN SCHUBIS, F LOS ANGELES, GAIJFORNIA.

GASMIXER.

Specification of Letters Patent.

Patented Nov. 2, 1920.

Application filed December 15, 1919. Serial No. 344,823.

. citizen. of the United States, residing at tain new and useful Improvements in tudinal view of Los Angeles, in the county of Los Angeles and State of California, have invented Groeras- Mixers, of which the following is a complete specification.

My invention relates to that class of gas mixers generally known as the Bunsen type and the purpose of my invention is to provide a mixer or burner having its supply and the control of gas at the mixing point thus obtaining a full line .pressure of gas at the said mixing point. In other mixers or burners the control and admission of gas from the supply pipe is remote from the actual mixing point and thus the gas pressure is lowered at the mixing point and the efficiency of the mixer or burner reduced. Another purpose of my invention is to provide a means whereby the streams of gas and air will be broken up completely which will result in more perfect mixing and avoiding strata of rich and thin mixtures of gas and air. Another purpose of my invention is to provide a mixer which will impart a rotary or spiral motion to the conical flame. I accomplish these objects by the mechanism illustrated by the accompanying drawing, in which: Figure 1 is a. top plan view of the mixer; Fig. 2 is a longithe mixer in section; Fig. 3 is a front end view of the mixer with the nozzle removed; Fig. 1 is a section through the air ports, taken on the line X-X in Fig. 1; Fig. 5 is a section through the front end of the nozzle, taken on the line in Fig. 1. Similar numbers refer to similar parts in the several views.

The gas chamber 1 is of approximately cylindrical shape and is provided with a gas inlet 2 having a screw thread or other suitable means for connecting same to a gas supply pipe. 3 is a boss with a tapped hole suitable to attach the mixer to a bracket or other supporting means. At the back of the gas chamber 1 is a boss 1,- threaded on the outside to receive the gland 5 which may be packed to make a gas tight joint. The

' inside of the boss 4: is tapped to receive the valve-stem 6, the said valve-stem having a handle 7 attached to its rear end, for the purpose of opening or closing the gas supply by screwing the said valve'stem in or out through said boss 4. The inner end 12 of the valve-stem 6 is tapered to a cone shape adapted to. seat on the inner end of the gas nozzle 8. This gas nozzle 8 is integral with the inner Wall or septum 9 ofthe gas chamber 1 and projects into the air mixing chamber 13. Through this gas nozzle 8 is a small hole or port with its inner side tapered to receive and seat the valve 12. Integral with the gas chamber casting 1 is a cylindrical air mixing chamber 13 having its longitudinal axis uniform with the axis of the gas nozzle 8. Around the periphery of the air mixing chamber 13 are located slots or openings 14:, for the admission of air to the mixer. The outer end 15 of the air mixing chamber 13 is bored out to receive the auxiliary mixing tube '16. Mounted on the outside of the air mixing chamber 13, and surrounding the said chamber, is a sleeve 17 having slots 18 corresponding to the slots 14: in the chamber 13. The sleeve 17 is so mounted that it can be rotated about the air mixing chamber 13, the amount of such rotation being fixed and determined by the slotted lug 19 which is locked in position by the set screw 20. In the recess 15 in the outer end of the air mixing chamber 13, and

inserted between the base of the said recess and the inner end of the auxiliary mixing tube 16 is a wire netting 21. If preferred a plate of perforated sheet metal may be used in place of the wire gauze or netting. The auxiliary mixing tube 16 consists of a tapering cylinder whose larger and inner end 22 is adapted to be inserted into the outer end 15 of the air mixing chamber 13, and the tube 16 may be held in such position by a screw thread, or by set screws 23 as shown,

or by other convenient means. The interior surface of the tube 16 is fluted with longi-.

tudinal spiral corrugations 21, which serve the purpose of giving the mixture of gas and air a spiral whirling motion as it leaves the mouth of the tube 16. Located on the mixing tube 16 are the secondary mixing chamber 25 and the tertiary mixing chamber 26. These mixing chambers 25 and 26 are integral with the tube 16 and are formed by expanding the form of the tube 16 into two annular recesses of larger diameter and with curved fillets and interior surfaces connectin with the interior surface of the tube 16. he outer or tertiary mixing chamber 26 is smaller than the chamber 25, conformmixing chamber 26 is also shorter on its longitudinal axis than the secondary chamber 25. The outer end of the mixing tube 1.6 is provided with a screw thread 27 or other convenient means for attaching the mixer to a furnace or fire-box if so desired. There may be an additional number of auxiliary mixing chambers similar to 25 .and 26, if so desired without departing from the spirit of my invention.

The operation of my device is as follows: The mixer having been connected to a gas supply pipe at the gas inlet 2, the gas being turned on fills the gas chamber 1. The handle 7 is then turned opening the needle valves 6 and 12 and allowing the gas to flow through the gas nozzle 8 into the air mixing chamber 13. The set-screw 20 is then loosened and the sleeve 17 rotated until the slots 18 in the said sleeve come into partial or entire registry with the slots 14 in the said mixing chamber 13, thus partially or wholly opening the slots 18 and 14 for the passage of airwhich is drawn in by the partial vacuum created by the stream of gas rushing through the gas nozzle 8, the air mixin chamber 13 and the mixing tube 16. This crude and imperfect mixture of gas and air then passes through the screen or netting 21 which breaks up all strata or separate streams of gas and air and by reducing a few large stratified currents to minute streams of almost infinite number, a.

remarkably perfect mixture is obtained. This mixture then passes into the mixing tube 16 where it is given a spiral motion by the rilfling or spiral grooves 24. The mixture then reaches the secondary mixing chamber 25 and quickly expands to fill the same, but the pressure and momentum of the stream at once carries it into the contracted section 28 and thence into the tertiary mixing chamber where the same process 1s repeated, and finally into the last-contracted section 29 and out of the mouth of the nozzle 30. This combination of forward spiral whirling motion together with repeated expansions and contractions produces a most perfect mixtureof the gas and air and when properly regulated by the gas valve 12 and the air controlling sleeve 17 tion'. When thls stream is lighted as it emerges from the mouth 30 of the nozzle it gives a comcal-shaped long flame with a rapid spiral whirling motion and of a perfect blue color.

What I claim as m 1. In a gas mixer; a gas chamber; an air mixing chamber; a gas port and valve connecting said gas and air mixing chambers; means for admitting and regulating the supply of gas and air to' said mixing chamber an auxiliary mixing tube provided with one or more expansion chambers and an ininvention and desire. to secure by Letters atent is 2-- terior surface of longitudinal spiral grooves:

all substantially as shown and described.

2.' In a gas mixer; a gas chamber; an air mixing chamber; a gas port connecting said gas and air mixing chambers; means for admitting and regulating the supply of gas and air to said mixing chamber; an auxiliary mixing tube provided with one or more expansion chambers and an interior surface of. longitudinal spiral grooves, and a perforated plate or screen transversely located between said air mixing chamber and said mixing tube; all substantially as shown and described.

3. In a gas mixer; a gas chamber, an air mixing chamber adjacent to said gas chamber; a port connecting said gas and air mixing chambers; a valve in said port; a sleeve rotatably mounted on said air mixing chamber; air ports in said sleeve and in said air chamber adapted to be'opened or closed by the rotation of said sleeve; an auxiliary mixing tube connecting with said air mixing chamber and having the same longitudinal axis as said gas port and valve; one or more annular expansion chambers and longitudinal spiral grooves on the interior surface of said tube, and a screen transversely located between said air mixing chamber and said mixing tube; all substantially as shown and described.

JOHN SCHU'RSL Witnesses:

WILLARD H. CLARK, B. C. BERG. 

